Reflector-assisted self-injection locking microcavity frequency comb device

Abstract

The invention discloses a reflector-assisted self-injection locking micro-cavity frequency comb device. The device comprises a micro-ring resonant cavity and an adjustable reflector structure, the adjustable reflector structure is arranged at a downloading port of the micro-ring resonant cavity and used for receiving forward transmission light output by the downloading port, reflecting the forward transmission light based on an adjustable power reflection coefficient and a reflection additional phase and feeding back the reflected light to the micro-ring resonant cavity through the downloading port. Therefore, the power of a forward transmission light field in the micro-ring resonant cavity is enhanced. The device disclosed by the invention is beneficial to optimizing the distribution of the optical field in the cavity, enhancing the effective pumping power and improving the generation efficiency and the stability of the soliton frequency comb.

Description

Technical Field

[0001] This invention relates to the fields of integrated optics and nonlinear optics, and more specifically, to a mirror-assisted self-injection locking microcavity frequency comb device. Background Technology

[0002] Microcavity frequency combs, as integrated, highly coherent broadband light sources, have significant application value in high-speed communication, precision measurement, and other fields. In recent years, microcavity frequency comb schemes based on self-injection locking (SIL) technology have become a research hotspot. Self-injection locking systems typically use a semiconductor laser to output pump light, which is injected into a high-Q microring resonator, forming a soliton frequency comb through nonlinear effects within the cavity. The feedback mechanism in the system can significantly reduce the drift between the laser and the microcavity resonant frequency, improving the generation efficiency and stability of the frequency comb.

[0003] However, most existing self-injection locked microcavity frequency combs rely on Rayleigh scattering or material inhomogeneities inherent within the micro-ring cavity to generate feedback. This passive feedback mechanism suffers from randomness and uncontrollability in feedback intensity, making it particularly difficult to achieve efficient soliton state locking and broadband frequency comb output at low pump power. Therefore, how to achieve flexible and controllable adjustment of the feedback mechanism in a self-injection locked microcavity frequency comb system, thereby optimizing the intracavity optical field distribution and enhancing the effective pump power, is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0004] In order to solve at least one of the technical problems in the background art, the present invention proposes a mirror-assisted self-injection locking microcavity frequency comb device.

[0005] The mirror-assisted self-injection locking microcavity frequency comb device includes: a microring resonant cavity and an adjustable mirror structure;

[0006] The adjustable reflector structure is disposed at the download port of the micro-ring resonator and is used to receive the forward transmission light output from the download port. Based on the adjustable power reflection coefficient and the additional reflection phase, the forward transmission light is reflected and the reflected light is fed back to the micro-ring resonator via the download port.

[0007] Optionally, the adjustable mirror structure includes a Mach-Zehnder interferometer and a Sagnac ring; the Mach-Zehnder interferometer is used to adjust the power reflection coefficient of the adjustable mirror structure, and the Sagnac ring is used to adjust the additional reflection phase of the adjustable mirror structure.

[0008] Optionally, at least one interferometer arm of the Mach-Zehnder interferometer is provided with a first phase shifter, which is used to adjust the power reflection coefficient of the adjustable mirror structure by adjusting the phase difference between the interferometer arms.

[0009] Optionally, a second phase shifter is provided on a portion of the waveguide of the Sagnac ring. The second phase shifter is used to adjust the additional reflection phase of the tunable mirror structure by adjusting the total phase of the light transmission within the ring.

[0010] Optionally, the mirror-assisted self-injection locking microcavity frequency comb device further includes: an external driving circuit;

[0011] The external drive circuit is connected to the first phase shifter and the second phase shifter, and is used to adjust the power reflection coefficient and / or the additional reflection phase of the adjustable reflector structure by adjusting the first phase shifter and / or the second phase shifter.

[0012] Optionally, the external driving circuit is specifically used to independently and continuously adjust the power reflection coefficient and additional reflection phase of the adjustable reflector structure in an electronically controlled manner.

[0013] Optionally, the external driving circuit is specifically used to adjust the power reflection coefficient of the adjustable reflector structure to a preset high reflection value range, and to adjust the additional reflection phase of the adjustable reflector structure to a preset value.

[0014] Optionally, the external driving circuit is specifically used to adjust the power reflection coefficient of the adjustable mirror structure to a first preset value, and to adjust the additional reflection phase of the adjustable mirror structure to a second preset value, wherein the first preset value and the second preset value are determined based on the pump power, the micro-ring Q value, the coupling coefficient, and the soliton state type.

[0015] Optionally, the microring resonator is an up-and-down type microring resonator.

[0016] Optionally, the mirror-assisted self-injection locked microcavity frequency comb device further includes: a distributed feedback laser; the distributed feedback laser is used to provide pump light to the microring resonant cavity.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention integrates an adjustable mirror structure at the download port of a microring resonator. By adjusting the power reflection coefficient and additional reflection phase of the feedback path, the feedback intensity and phase can be controlled. This allows for flexible control of the energy and distribution of the feedback light injected into the cavity, thereby optimizing the intracavity optical field distribution and enhancing the effective pump power. This helps improve the generation efficiency and stability of the soliton frequency comb, effectively solving the problems of uncontrollable feedback and difficulty in optimizing the intracavity optical field in existing self-injection locked microcavity frequency combs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of a mirror-assisted self-injection locking microcavity frequency comb device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the adjustable reflector structure according to an embodiment of the present invention;

[0022] Figure 3 This is the low-power microcavity frequency comb generation spectrum of an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the soliton step generated during detuning scanning in an embodiment of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] This invention aims to address the problems of random and uncontrollable feedback intensity in existing self-injection locked microcavity frequency combs, and the inability to generate microcavity frequency combs under low-power conditions due to limited light source power. Specifically, it aims to provide a self-injection locked microcavity frequency comb scheme with flexibly adjustable feedback intensity, capable of helping to reduce the pump power threshold required for soliton generation. To solve the above problems and achieve the above objectives, this invention proposes a mirror-assisted self-injection locked microcavity frequency comb device.

[0028] Figure 1 This is a schematic diagram of a mirror-assisted self-injection locking microcavity frequency comb device according to an embodiment of the present invention, as shown below. Figure 1 As shown, in one embodiment of the present invention, the mirror-assisted self-injection locking microcavity frequency comb device of the present invention includes: a microring resonant cavity and an adjustable mirror structure.

[0029] An adjustable reflector structure is disposed at the download port of the microring resonator to receive the forward transmission light output from the download port. Based on the adjustable power reflection coefficient and the additional reflection phase, the forward transmission light is reflected and fed back to the microring resonator via the download port to optimize the light field distribution in the microring resonator and enhance the power of the forward transmission light field in the microring resonator.

[0030] like Figure 1 As shown, the present invention integrates an on-chip adjustable mirror structure in the drop port of the microring resonator.

[0031] In one embodiment of the present invention, the adjustable mirror structure can be composed of a Mach-Zehnder interferometer connected in series with a Sagnac ring. This structure can independently adjust the intensity and phase of the feedback light, and the feedback parameters can be precisely set through an electronically controlled phase shifter. The adjustable mirror structure is integrated inside the micro-ring resonator chip, resulting in a short feedback path, fast adjustment speed, and easy integration with other photonic devices.

[0032] This invention employs an adjustable reflector structure, which effectively solves the problems of traditional microcavity feedback relying on material scattering and uncontrollable feedback intensity. The device can flexibly adjust feedback parameters according to actual operating requirements, optimize the intracavity optical field distribution, enhance effective pump power, and contribute to the stable generation of soliton states.

[0033] In one embodiment of the present invention, the microring resonator is specifically an add-drop microring resonator.

[0034] In one embodiment of the present invention, the microring resonator adopts an add-drop structure. This structure includes an input port, an output port, and a ring waveguide. Input light is coupled into the microring through the input port, resonates within the ring, and is output through the drop port after energy coupling. The add-drop microring resonator structure facilitates efficient coupling and separation of optical signals, is suitable for combination with on-chip integrated feedback or control modules, and helps improve the overall system performance and integration.

[0035] In one embodiment of the present invention, a top-down microring resonator is used as the core optical resonant structure. The microring has a high quality factor (Q value) and is designed to operate in the anomalous dispersion region to support the generation of soliton frequency combs. The present invention integrates an on-chip adjustable mirror structure at the download port of the top-down microring resonator, and adjusts the reflection coefficient and additional reflection phase electronically. This structure allows for flexible control of the intensity and phase of the feedback light, effectively optimizing the intracavity optical field distribution, enhancing the effective pump power, and thus improving the generation efficiency of soliton frequency combs and the stability of system operation.

[0036] like Figure 1 As shown, in one embodiment of the present invention, the mirror-assisted self-injection locked microcavity frequency comb device of the present invention further includes: a distributed feedback laser; the distributed feedback laser is used to provide pump light to the micro-ring resonant cavity.

[0037] like Figure 1 As shown, in one embodiment of the present invention, the mirror-assisted self-injection locked microcavity frequency comb device mainly includes: a DFB laser, a microring resonator chip, and an adjustable mirror structure, the adjustable mirror structure being integrated on the microring resonator chip. The DFB laser serves as the pump source, and the output pump light is coupled into the microring resonator through the Input port. Inside the microring cavity, the laser undergoes resonance and nonlinearity, with some energy propagating along the ring path. The microring resonator adopts an up-down type structure, with the optical signal output through the Drop port. The Drop port is connected to an adjustable mirror structure, used to reflect the output forward propagating light and adjust the reflection intensity and phase of the feedback light. The adjusted feedback light is then coupled back into the microring resonator through the Drop port, achieving optimization of the cavity optical field and precise control of the system feedback mechanism. This structure effectively improves the effective pump power within the cavity, enhancing the generation efficiency and stability of the soliton frequency comb.

[0038] Figure 2 This is a schematic diagram of the adjustable reflector structure according to an embodiment of the present invention, as shown below. Figure 2 As shown, in one embodiment of the present invention, the adjustable reflector structure of the present invention includes a Mach-Zehnder interferometer and a Sagnac ring arranged in cascade.

[0039] The Mach-Zehnder interferometer is used to adjust the power reflection coefficient of the adjustable mirror structure. The Sagnac ring is used to adjust the additional reflection phase of the adjustable mirror structure.

[0040] like Figure 2 As shown, in one embodiment of the present invention, the adjustable reflector structure of the present invention is composed of a Mach-Zehnder Interferometer (MZI) and a Sagnac loop cascaded together.

[0041] like Figure 2 As shown, in one embodiment of the present invention, at least one interferometer arm of the Mach-Zehnder interferometer is provided with a first phase shifter, which is used to adjust the power reflection coefficient of the adjustable mirror structure by adjusting the phase difference between the interferometer arms.

[0042] like Figure 2 As shown, in one embodiment of the present invention, a second phase shifter is provided on a portion of the waveguide of the Sagnac ring. The second phase shifter is used to adjust the additional reflection phase of the tunable mirror structure by adjusting the total phase of the light transmission within the ring.

[0043] like Figure 2 As shown, a Mach-Zehnder interferometer consists of two beam splitters and two parallel optical waveguide arms. The input light is split into two paths at the first beam splitter, each propagating along one of the two interferometer arms. Each interferometer arm can integrate an electrically controlled phase shifter (here referring to the first phase shifter) to adjust the phase difference between the two arms. The two beams interfere after rejoining at the second beam splitter, and the intensity and phase of the output light depend on the phase difference between the two arms. This invention, by adjusting the first phase shifter, can precisely control the reflection coefficient of the mirror structure, achieving electrically controlled adjustment of the feedback intensity.

[0044] like Figure 2 As shown, the Sagnac ring structure, located after the Mach-Zehnder interferometer, consists of a closed ring waveguide. Light from the Mach-Zehnder interferometer, after coupling into the Sagnac ring, propagates clockwise and counterclockwise along the ring waveguide, and then re-converges at the ring's output. This invention, through an integrated phase shifter (here referring to the second phase shifter) within the ring waveguide, can adjust the overall phase of light propagating within the ring. This allows for precise control of the additional phase of the reflected feedback light, thereby achieving electronically controlled optimization and adjustment of the feedback phase.

[0045] In an optional embodiment of the present invention, a first phase shifter is provided on each of the two interference arms of the Mach-Zehnder interferometer.

[0046] In an optional embodiment of the present invention, a first phase shifter is provided on each of the two interference arms of the Mach-Zehnder interferometer. By adjusting the phase of each of the two interference arms separately, the phase difference between the two arms can be controlled more flexibly and precisely, thereby achieving independent adjustment of the reflection coefficient of the feedback light. This dual-arm phase shifter structure helps to improve the control accuracy of the feedback parameters and the adaptability of the system.

[0047] In one embodiment of the present invention, the mirror-assisted self-injection locking microcavity frequency comb device of the present invention further includes: an external driving circuit;

[0048] The external drive circuit is connected to the first phase shifter and the second phase shifter, and is used to adjust the power reflection coefficient and / or the additional reflection phase of the adjustable reflector structure by adjusting the first phase shifter and / or the second phase shifter.

[0049] In one embodiment of the present invention, the first phase shifter and the second phase shifter are connected to an external driving circuit via metal electrodes, thereby enabling independent, continuous, and electrically controlled adjustment of the power reflection coefficient and the additional reflection phase by the external driving circuit.

[0050] In one embodiment of the present invention, the external driving circuit is specifically used to independently and continuously adjust the power reflection coefficient and additional reflection phase of the adjustable reflector structure in an electronically controlled manner.

[0051] In one embodiment of the invention, an external driving circuit is connected to a first phase shifter and a second phase shifter via metal electrodes, applying independent electrical control signals to each phase shifter. The first phase shifter adjusts the phase difference between the two arms of the Mach-Zehnder interferometer, thereby precisely controlling the power reflection coefficient of the mirror structure. The second phase shifter is located within the Sagnac ring and is used to adjust the total phase of the optical path within the ring, thereby adjusting the additional phase of the reflection. By controlling the electrical signals of these two phase shifters separately, the external driving circuit can achieve independent, continuous, and programmable adjustment of the power reflection coefficient and the additional phase of the reflection, meeting different feedback optimization requirements.

[0052] In one embodiment of the present invention, the external driving circuit can employ a voltage or current source to transmit control signals to the on-chip first and second phase shifters via metal electrodes. This enables precise adjustment of the phase shifters without the need for complex external optical paths or manual adjustments. The entire adjustment process is fast-responding, facilitating automation and real-time control. This electronically controlled adjustment method helps achieve independent and continuous adjustment of feedback parameters, meeting different requirements for feedback strength and phase under various operating conditions. It significantly improves the system's flexibility and adaptability, and also facilitates mass production and chip-level integration.

[0053] In one embodiment of the present invention, the external driving circuit is disposed outside the microring resonant cavity chip and connected to the phase shifter on the chip via metal electrodes. This design helps to maintain a compact chip structure and facilitate integration, while also enabling convenient high-precision electronic control adjustment of the phase shifter. Keeping the driving circuit independent of the microring resonant cavity chip not only facilitates later maintenance and functional upgrades but also allows for adaptation to different control schemes, meeting the flexibility and scalability requirements of actual systems for adjusting feedback parameters.

[0054] The working principle of the device of the present invention is as follows:

[0055] The pump laser is first coupled into the microring resonator through the input port, forming forward and reverse propagating optical fields within the cavity. A portion of the forward propagating energy is output through the download port and enters an on-chip tunable mirror structure. The mirror can independently and electrically control the reflection intensity and phase of the incident light, feeding back a portion of the controlled light into the microring cavity with a set reflection coefficient and additional phase. The feedback light, along with the forward and reverse propagating optical fields within the cavity and the Rayleigh backscattered light, precisely adjusts the system's feedback conditions. By adjusting the phase difference between the Mach-Zehnder interferometer (MZI) arms and the propagation phase of the Sagnac ring, the relative relationship between the feedback light and the cavity optical field can be flexibly optimized, achieving optimization of the cavity optical field distribution and pump energy utilization. This scheme effectively increases the effective pump power within the cavity, reduces the soliton locking threshold, improves the frequency comb generation efficiency and system stability, while overcoming the shortcomings of traditional passive feedback mechanisms such as high randomness and difficulty in precise parameter control. It boasts advantages such as high integration, strong controllability, and suitability for mass production applications.

[0056] In one embodiment of the present invention, the external driving circuit is specifically used to adjust the power reflection coefficient of the adjustable reflector structure to a preset high reflection value range, and to adjust the additional reflection phase of the adjustable reflector structure to a preset value.

[0057] In one embodiment of the present invention, the preset high reflectivity range is specifically a range close to total internal reflection. The present invention, through theoretical and numerical simulations, has found that when the reflection coefficient is close to total internal reflection and the additional phase is optimized and set to a specific value, this controllable reflection mechanism can effectively enhance the power of the forward-transmitting optical field within the resonant cavity (compared to no reflection or unoptimized reflection), which is equivalent to breaking through the limitations on the pump power threshold in traditional theory.

[0058] This invention adjusts the reflection coefficient to near total internal reflection and optimizes the reflected phase, allowing the feedback light to be efficiently superimposed on the forward propagating light within the cavity. This enables more pump energy to be effectively coupled into the micro-ring cavity. This not only increases the optical field intensity within the resonant cavity but also further promotes the formation of soliton states, which is beneficial for the stable output of the frequency comb. Using this controllable feedback mechanism, the system can achieve efficient locking at lower pump power, reducing the performance requirements of the laser.

[0059] The enhanced intracavity power of this invention enables the excitation of intracavity nonlinear effects using a DFB laser detuning scanning method at relatively low external pump power (close to or slightly above the conventional soliton generation threshold), such as... Figure 3 As shown, and the evolution of multi-level soliton states, such as Figure 4 As shown.

[0060] In one embodiment of the present invention, the external driving circuit is specifically used to adjust the power reflection coefficient of the adjustable mirror structure to a first preset value and to adjust the additional reflection phase of the adjustable mirror structure to a second preset value, wherein the first preset value and the second preset value are determined based on the pump power, the microring Q value, the coupling coefficient, and the soliton state type.

[0061] In one embodiment of the present invention, in practical operation, a suitable first preset value (power reflection coefficient) and a second preset value (reflection additional phase) can be determined manually or by computer based on the pump power, micro-ring Q value, coupling coefficient, and target soliton state type. The external drive circuit then precisely adjusts the on-chip adjustable mirror structure according to the set preset values, achieving independent and flexible electronic control adjustment of the feedback strength and phase. This not only adapts to different operating conditions and device parameters but also effectively avoids performance fluctuations caused by the uncontrollability of traditional feedback methods, improving device performance consistency and the predictability of system operation.

[0062] In one embodiment of the present invention, before the device operates, the Q value and coupling coefficient of the micro-ring resonator can be measured or preset, the output power of the pump laser can be set, and the target soliton state type can be selected according to application requirements. Combining previous numerical simulation results or experimental databases, the most suitable power reflection coefficient and additional reflection phase under the current pump power, Q value, coupling coefficient, and target soliton state type can be determined by table lookup or calculation as the first and second preset values. During debugging, the two preset parameters are input to the external driving circuit, which adjusts the first and second phase shifters in the adjustable mirror structure to achieve optimal settings for the feedback reflection coefficient and additional phase. During frequency comb operation status monitoring, if an unstable soliton locking state or abnormal output is detected, the reflection parameters can be finely adjusted through the feedback mechanism to achieve real-time optimization of system performance. This method not only realizes personalized setting of feedback parameters for different device parameters and target operating states but also effectively improves the output efficiency, operational stability, and application consistency of the microcavity frequency comb device.

[0063] As can be seen from the above embodiments, compared with the prior art, the mirror-assisted self-injection locking microcavity frequency comb device provided by the present invention has the following beneficial effects:

[0064] Overcoming the pump power limitation: Theory and experiments show that when the mirror is set to a strong reflection state and the additional phase is optimized to a specific value, this device can effectively enhance the power of the forward-propagating optical field within the microring resonator. This intracavity power enhancement effect physically breaks through the theoretical power threshold limitation of traditional self-injected locked soliton frequency comb generation schemes. This can help the system excite the Kerr frequency comb and generate soliton states under conditions of relatively low DFB laser pump power (close to or slightly above the microcavity pump threshold).

[0065] Enhanced feedback controllability: An on-chip integrated adjustable mirror structure enables independent and flexible electronic control adjustment of the feedback intensity and phase. This allows the system to optimize the feedback mechanism in real time based on different operating states, device parameters (such as micro-ring Q-value and coupling coefficient), and target operating modes (such as different soliton states). This overcomes the unpredictable and inconsistent device performance issues caused by the randomness of traditional device feedback.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mirror-assisted self-injection locking microcavity frequency comb device, characterized in that, include: Micro-ring resonator and adjustable mirror structure; The adjustable reflector structure is disposed at the download port of the micro-ring resonator and is used to receive the forward transmission light output from the download port. Based on the adjustable power reflection coefficient and the additional reflection phase, the forward transmission light is reflected and the reflected light is fed back to the micro-ring resonator via the download port.

2. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 1, characterized in that, The adjustable mirror structure includes a Mach-Zehnder interferometer and a Sagnac ring; the Mach-Zehnder interferometer is used to adjust the power reflection coefficient of the adjustable mirror structure, and the Sagnac ring is used to adjust the additional reflection phase of the adjustable mirror structure.

3. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 2, characterized in that, At least one interferometer arm of the Mach-Zehnder interferometer is provided with a first phase shifter, which is used to adjust the power reflection coefficient of the adjustable mirror structure by adjusting the phase difference between the interferometer arms.

4. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 3, characterized in that, A second phase shifter is provided on a portion of the waveguide of the Sagnac ring. The second phase shifter is used to adjust the additional reflection phase of the tunable mirror structure by adjusting the total phase of the light transmission within the ring.

5. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 4, characterized in that, Also includes: External drive circuit; The external drive circuit is connected to the first phase shifter and the second phase shifter, and is used to adjust the power reflection coefficient and / or the additional reflection phase of the adjustable reflector structure by adjusting the first phase shifter and / or the second phase shifter.

6. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 5, characterized in that, The external drive circuit is specifically used to independently and continuously adjust the power reflection coefficient and additional reflection phase of the adjustable reflector structure in an electronically controlled manner.

7. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 5, characterized in that, The external driving circuit is specifically used to adjust the power reflection coefficient of the adjustable reflector structure to a preset high reflection value range, and to adjust the additional reflection phase of the adjustable reflector structure to a preset value.

8. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 5, characterized in that, The external driving circuit is specifically used to adjust the power reflection coefficient of the adjustable mirror structure to a first preset value, and to adjust the additional reflection phase of the adjustable mirror structure to a second preset value, wherein the first preset value and the second preset value are determined based on the pump power, the micro-ring Q value, the coupling coefficient, and the soliton state type.

9. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 1, characterized in that, The microring resonator is an up-and-down type microring resonator.

10. The mirror-assisted self-injection locking microcavity frequency comb device according to claim 1, characterized in that, Also includes: Distributed feedback laser; The distributed feedback laser is used to provide pump light to the micro-ring resonator.

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